Configuring Logging in Flask
Logging can be configured in a Flask application using Python's standard logging module. Here is a simple example in which logging is output to a file and to the console:
import logging
from import RotatingFileHandler
from flask import Flask
app = Flask(__name__)
# Configure logging
handler = RotatingFileHandler('', maxBytes=10000, backupCount=1)
()
formatter = ('%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]')
(formatter)
(handler)
if not :
# If not in debug mode, output logs to stdout
stream_handler = ()
stream_handler.setLevel()
(stream_handler)
In this example, a named spinning file processor is created and bound to the Flask application's logger. If you are not in debug mode, a stream processor is also created and bound to the logger to output logging to the console.
To log in your application, you can use a logger object, for example:
@('/')
def index():
('Processing request for index page')
return 'Hello, world!'In this example, the info() method will be used to record a message-level log indicating that a request for the home page is being processed.
It is important to note that configuring logging is a highly customizable process that allows you to add or remove handlers, filters, etc. as you see fit. This example only provides a simple starting point to get you started with your custom configuration.
Using logging in other pages of a Flask application
To use logging in other pages of a Flask application, you can log information by getting the current application's logging object. You can use the following code to get the logging object:
Importing Log Objects
import logging logger = (__name__)
This code will create a Logger object named __name__, which will have the same name as the current module. You can then use this Logger object to log messages, for example:
log
from flask import render_template
from app import logger
@('/about')
def about():
('Rendering about page')
return render_template('')
In this example, when the route processes the /about path, a message-level log is recorded and the template is rendered.
Note that unlike the Flask application logger mentioned earlier, the logger created here is only used for logging the current module or blueprint. If you want to share logging configurations and handlers throughout your application, you should use the application logger mentioned earlier.
Module to use the logger in the app
If you have an app object already created and configured, and you want to use the same logger in another module, you can get an instance of the application, and thus the logger object for that application, by using the current_app method provided by Flask. Here is a simple example:
Define the logger in the app
#
import logging
from flask import Flask
app = Flask(__name__)
# Configure logging
handler = ()
()
formatter = ('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
(formatter)
(handler)
In this example, a Flask application named app is created and a logger that outputs to standard output is added to its logger object.
Using Loggers in Modules
# my_module.py
import logging
from flask import current_app
logger = (__name__)
def do_something():
# Get the current application logger object
app_logger = current_app.logger
('Starting to do something...')
# Perform some operations
app_logger.info('Doing something now...')
('Finished doing something.')
In this example, we have created another module, my_module.py, which contains a do_something() function. This function will first get the application's logger object by getting the current application's logger object. The logger object is then used to log information before and after some operations are performed, as well as using the application's logger object to log information during operations.
It is important to note that to use the current_app method, you must be operating in the Flask application context. In other words, you need to make sure that the method is called in either the request context or the application context.
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